[zone] Remove segment pooling from accounting allocator
This pooling introduces severe lock contention for Liftoff compilation, since each compilation uses its own Zone which does at least one segment allocation. It's also unclear whether pooling improves performance, since {malloc} should implement a similar pooling mechanism, but better optimized for multithreaded uses. Feel free to revert if this introduces significant regressions. R=verwaest@chromium.org Bug: v8:8916 Cq-Include-Trybots: luci.v8.try:v8_linux64_tsan_rel Change-Id: Iaf988bed898e35700f5f7f3310df8e01918de4c9 Reviewed-on: https://chromium-review.googlesource.com/c/1491632 Commit-Queue: Clemens Hammacher <clemensh@chromium.org> Reviewed-by: Ulan Degenbaev <ulan@chromium.org> Reviewed-by: Toon Verwaest <verwaest@chromium.org> Cr-Commit-Position: refs/heads/master@{#59959}
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